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Question

The correct statement regarding addition of sodium hydrogen sulphite to a carbonyl compound is

A
It can be used as a method to purify and separate aldehyde
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B
Bisulphite addition product cannot be hydrolysed in basic medium
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C
The attack happens by the negetive charge on oxygen
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D
The rate of addition is always greater for ketones than aldehydes
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Solution

The correct option is A It can be used as a method to purify and separate aldehyde
The attack happens by lone pair over sulphur. The rate of addition is much grater for aldehydes and can be used for purification/separation bisulphite addition can be reversed by acidic as well as basic hydrolysis.

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